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Matthew Offord, the Tory MP for Hendon, on Thursday became the hundredth MP to say he would vote against the Prime Minister's deal, warning that it will leave the UK "bound" to the EU and put the Union at risk.

It came as Jo Johnson, a former minister who quit in protest at the deal, warned that the Tories will face a landslide defeat at the next election on a scale similar to 1997 if they push ahead with Mrs May's Brexit deal.